CN110029275A - A kind of production method of high voltage transmission line steel - Google Patents

A kind of production method of high voltage transmission line steel Download PDF

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Publication number
CN110029275A
CN110029275A CN201910431066.9A CN201910431066A CN110029275A CN 110029275 A CN110029275 A CN 110029275A CN 201910431066 A CN201910431066 A CN 201910431066A CN 110029275 A CN110029275 A CN 110029275A
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Prior art keywords
temperature
steel
slag
carbon
cold
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CN201910431066.9A
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Chinese (zh)
Inventor
王旭冀
罗登
陈军
肖冬
林丹
朱建成
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Hunan Valin Xiangtan Iron and Steel Co Ltd
Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Priority to CN201910431066.9A priority Critical patent/CN110029275A/en
Publication of CN110029275A publication Critical patent/CN110029275A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/008Ferrous alloys, e.g. steel alloys containing tin
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention relates to a kind of production method of high voltage transmission line steel, the chemical composition mass percent of steel is C=0.84%~0.85%, Si=0.15%~0.19%, Mn=0.53%~0.57%, P≤0.012%, S≤0.010%, Ni≤0.02%, Ti≤0.005%, Al≤0.005%, Gr≤0.060%, Cu≤0.03%, Ti≤0.0015%, As≤0.03%, Sn≤0.03%, remaining is Fe and inevitable impurity.Converter controls carbon content using catch carbon method, and low nitrogen carburant is added afterwards to be ensured into ladle furnace carbon to be 0.80% ~ 0.82%;Tapping process uses the basicity in the first slag making control steel of the slag system prepared for 0.5 ~ 0.6;It is 0.75 that slag system to finishing slag basicity is finely tuned when LF refining, limits into target carbon, manganese control before outbound, into VD furnace soft blow after appear on the stage casting;Continuous casting is cast using low overheat, and two is cold using strong cold mode.Steel rolling completely inhibits the precipitation of network cementite, even tissue by the aluminium Baogang that controlled rolling and controlled cooling produces, and sorbite rate is up to 95%, and intensity reaches 1250MPa.

Description

A kind of production method of high voltage transmission line steel
Technical field
The invention belongs to metallurgical technology fields, are related to a kind of production method of high voltage transmission line steel.
Technical background
Aluminium Baogang is for the core wire steel in high voltage transmission line.With the development of high voltage transmission line, it is desirable that the electricity of conducting wire It hinders smaller and smaller, it is necessary to conducting wire be done using material of good performance, should also increase the cross-sectional area of conducting wire, reduce resistance.But Since high-voltage line conducting wire is too thick, it is desirable to biggish mechanical strength, so high-voltage line central core must be that mechanical strength is big Steel wire, make power transmission line be not easy to break.At present under the conditions of pursuit electric conductivity is superior, with the high-intensitive core of iso-cross-section Line periphery can twist the aluminum steel of higher sectional area.In this context, the demand of the aluminium Baogang of high-carbon rank will be increasing.
It is domestic at present that research and development small lot pilot stage on probation is concentrated mainly on to the small billet high-carbon steel of aluminium Baogang, mainly grind Study carefully the homogenization and sorbite rate of tissue.And the homogenization organized is mainly by weakening the center generated in aluminium Baogang steelmaking process The influence of carbon segregation solves.It studies at present and is concentrated mainly on Continuous Casting Soft Reduction, low overheat casting technique, and sorbite rate master To pass through controlled rolling, laying temperature control cooling.
Summary of the invention
The present invention is intended to provide a kind of production method of high voltage transmission line steel, by the wire rod tissue sorbite of high-carbon aluminium Baogang Rate is controlled 95% or more, and tensile strength reaches 1250MPa, can be good at meeting the core wire requirement that high voltage power transmission answers steel user.
Technical solution of the present invention:
A kind of production method of high voltage transmission line steel, the chemical composition mass percent of steel be C=0.84%~0.85%, Si= 0.15%~0.19%, Mn=0.53%~0.57%, P≤0.012%, S≤0.010%, Ni≤0.02%, Ti≤0.005%, Al≤ 0.005%, Gr≤0.060%, Cu≤0.03%, Ti≤0.0015%, As≤0.03%, Sn≤0.03%, remaining is Fe and can not keep away The impurity exempted from;Production craft step includes:
(1) smelt: converter uses catch carbon method, C=0.40 or more when tapping;The slag charge prepared, first slag making basicity are added before tapping Control is 0.5~0.6;Tapping process uses homlolgation, and control C=0.80%~0.82%, LF finely tunes slag charge, controls finishing slag basicity 0.75, mid-term tune carbon, manganese to target component are outbound after soft blow 5min.It appears on the stage casting into VD soft blow 35min, controls outbound temperature Degree is 28~38 DEG C more than liquidus temperature.
(2 continuous castings: using strong cold, specific water 2.20L/kg, 18 DEG C~25 DEG C of the degree of superheat, slab intrados center is clicked through 900~930 DEG C of withdrawal straightening machine temperature, 700~750 DEG C of machine temperature are cut into fire.
(3) it rolls: controlled rolling, slab 100~120min of heating time;1000~1100 DEG C of soaking section temperature, the time In 50~60min;920 DEG C~950 DEG C of finishing temperature.
(4) control cooling: directly Water cooling and blower are cold by force after rolling, and 980~950 DEG C of laying temperature, cooling rate 13.5~14.5 DEG C/s, 500~550 DEG C of winding temperature, original wire rod is obtained without to the harmful tissue of drawing.
Even tissue technology of the present invention is mainly set about from monitoring base temperature fine tuning continuous casting two cold intensity, by controlling casting process The middle different base temperature for drawing steel time different casting blank belonging positions influence to reduce continuous casting segregation, and organization design is then to be with sorbite The toughness tissue of matrix, there can be no to the harmful fragility tissue of drawing.
Beneficial effects of the present invention: in the case where no Continuous Casting Soft Reduction Technology supports, from high-carbon steel billet temperature control technology is created, weaken Continuous casting segregation influences;Series roolings new technology is waited with stelmor controlled rolling and control are cold, breaks through the cold technological limits of high line traffic control, sufficiently Playing equipment advantage, organization of production is the sorbite of 95% or more content and without to the high-carbon aluminium Baogang of drawing nocuousness abnormal structure, By the control of finished disk sorbite percentage 95% or more, tensile strength promotes the high Soxhlet of Fine Steel Casting iron in 1250MPa or more Body rate and high-intensitive research and development process;Using steel mill's existing equipment and process conditions, neither increase investment and production cost, again Improve production efficiency, energy-saving consumption-reducing.
Detailed description of the invention
The metallographic microscope of the wire rod of Fig. 1 embodiment of the present invention 1.
Specific embodiment
The contents of the present invention are further illustrated below with reference to embodiment.
Embodiment 1
High-carbon aluminium Baogang controls steel chemical composition such as table 1, remaining is Fe and inevitable impurity.Processing step includes:
(1) it smelts: converter terminal C=0.45%, C=0.81% when into LF;LF furnace refining slag finishing slag basicity is 0.76;VD soft blow 32min, out-station temperature are 1500 DEG C.
(2 continuous castings: continuous casting two cold specific water 2.20L/KG, 22 DEG C of the middle packet degree of superheat, monitoring slab intrados center, which clicks through, draws 900~910 DEG C of machine temperature is rectified, 705~745 DEG C of machine temperature is cut into fire, finely tunes two cold water distributions.
(3) roll: slab heating time 110min, bringing-up section temperature are controlled at 1050 DEG C, soaking zone time 56min, eventually Roll 940 DEG C of temperature.
(4) control cooling: directly Water cooling and blower are cold by force after rolling, 13.8 DEG C/s of cooling rate, and winding temperature 530~ 540℃。
The metallographic structure of sample wire rod and mechanics properties testing are shown in Table 2.
Embodiment 2
High-carbon aluminium Baogang controls steel chemical composition such as table 1, remaining is Fe and inevitable impurity.Processing step includes:
(1) it smelts: converter terminal C=0.55%, into LF furnace C=0.80%;LF furnace refining slag finishing slag basicity is 0.75;VD soft blow 33min, out-station temperature are 1500 DEG C.
(2) continuous casting: continuous casting two cold specific water 2.20L/KG, 22 DEG C of the middle packet degree of superheat, monitoring slab intrados center click through 910~920 DEG C of withdrawal straightening machine temperature, 706~740 DEG C of machine temperature are cut into fire, finely tunes two cold water distributions.
(3) roll: slab heating time 110min, bringing-up section temperature are controlled at 1050 DEG C, soaking zone time 60min, eventually Roll 950 DEG C of temperature.
(4) control cooling: directly Water cooling and blower are cold by force after rolling, 13.9 DEG C/S of cooling rate, and winding temperature 532~ 542℃。
The metallographic structure of sample wire rod and mechanics properties testing are shown in Table 2.
Embodiment 3
High-carbon aluminium Baogang controls steel chemical composition such as table 1, remaining is Fe and inevitable impurity.
(1) it smelts: converter terminal C=0.43%, into LF furnace C=0.81%;LF furnace refining slag finishing slag basicity is 0.75;VD soft blow 35min, out-station temperature are 1500 DEG C.
(2) continuous casting: continuous casting two cold specific water 2.20L/KG, 24 DEG C of the middle packet degree of superheat, monitoring slab intrados center click through 920~930 DEG C of withdrawal straightening machine temperature, 730~750 DEG C of machine temperature are cut into fire, finely tunes two cold water distributions.
(3) slab heating time 110min, the control of bringing-up section temperature is at 1050 DEG C, soaking zone time 60min, finishing temperature 950℃。
(4) control cooling: directly Water cooling and blower are cold by force after rolling, 13.9 DEG C/S of cooling rate, and winding temperature 522~ 532℃。
The metallographic structure of sample wire rod and mechanics properties testing are shown in Table 2.
Embodiment 4
High-carbon aluminium Baogang controls steel chemical composition such as table 1, remaining is Fe and inevitable impurity.Processing step includes:
(1) it smelts: converter terminal C=0.50%, into LF furnace C=0.81%;LF furnace refining slag finishing slag basicity is 0.75;VD soft blow 35min, out-station temperature are 1500 DEG C.
(2) continuous casting: continuous casting two cold specific water 2.20L/KG, 23 DEG C of the middle packet degree of superheat, monitoring slab intrados center click through 920~930 DEG C of withdrawal straightening machine temperature, 730~750 DEG C of machine temperature are cut into fire, finely tunes two cold water distributions.
(3) roll: slab heating time 110min, bringing-up section temperature are controlled at 1050 DEG C, soaking zone time 60min, eventually Roll 950 DEG C of temperature.
(4) control cooling: directly Water cooling and blower are cold by force after rolling, 13.9 DEG C/S of cooling rate, and winding temperature 510~ 540℃。
The metallographic structure of sample wire rod and mechanics properties testing are shown in Table 2.
The chemical component (%) of 1 embodiment steel of table
2 embodiment sample wire rod metallographic structure of table and mechanical property

Claims (1)

1. a kind of production method of high voltage transmission line steel, it is characterised in that: the chemical composition mass percent of steel be C=0.84%~ 0.85%, Si=0.15%~0.19%, Mn=0.53%~0.57%, P≤0.012%, S≤0.010%, Ni≤0.02%, Ti≤ 0.005%, Al≤0.005%, Gr≤0.060%, Cu≤0.03%, Ti≤0.0015%, As≤0.03%, Sn≤0.03%, remaining For Fe and inevitable impurity;Production craft step includes:
(1) smelt: converter uses catch carbon method, C=0.40 or more when tapping;The slag charge prepared, first slag making basicity are added before tapping Control is 0.5~0.6;Tapping process uses homlolgation, and control C=0.80%~0.82%, LF finely tunes slag charge, controls finishing slag basicity 0.75, mid-term tune carbon, manganese to target component are outbound after soft blow 5min;It appears on the stage casting into VD soft blow 35min, controls outbound temperature Degree is 28~38 DEG C more than liquidus temperature;
(2 continuous castings: using strong cold, specific water 2.20L/kg, 18 DEG C~25 DEG C of the degree of superheat, slab intrados center clicks through straightening 900~930 DEG C of machine temperature, 700~750 DEG C of machine temperature are cut into fire;
(3) it rolls: controlled rolling, slab 100~120min of heating time;1000~1100 DEG C of soaking section temperature, the time is 50 ~60min;920 DEG C~950 DEG C of finishing temperature;
(4) control cooling: directly Water cooling and blower are cold by force after rolling, and 980~950 DEG C of laying temperature, cooling rate 13.5~ 14.5 DEG C/s, 500~550 DEG C of winding temperature, original wire rod is obtained without to the harmful tissue of drawing.
CN201910431066.9A 2019-05-22 2019-05-22 A kind of production method of high voltage transmission line steel Pending CN110029275A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110616361A (en) * 2019-11-06 2019-12-27 湖南华菱湘潭钢铁有限公司 Production method of steel for annealing-free nitriding
CN113789478A (en) * 2021-09-16 2021-12-14 湖南华菱湘潭钢铁有限公司 Production method of cold heading steel bar
CN113862564A (en) * 2021-09-16 2021-12-31 湖南华菱湘潭钢铁有限公司 Production method of deep-drawing high-carbon steel wire rod
CN114875314A (en) * 2022-04-26 2022-08-09 湖南华菱湘潭钢铁有限公司 Production method of high-aluminum alloy steel
CN114990446A (en) * 2022-06-21 2022-09-02 湖南华菱湘潭钢铁有限公司 Production method of weather-resistant high-strength high-carbon steel

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CN102953005A (en) * 2011-08-19 2013-03-06 鞍钢股份有限公司 High-carbon and low-alloy steel wire rod for producing fine steel wires, and its manufacturing method
CN104451413A (en) * 2014-12-19 2015-03-25 重庆钢铁股份有限公司 Hard wire steel wire rod
CN107747060A (en) * 2017-11-12 2018-03-02 湖南华菱湘潭钢铁有限公司 The production method of high intensity high fatigue life spring steel
CN109047697A (en) * 2018-09-25 2018-12-21 湖南华菱湘潭钢铁有限公司 A kind of production method of tyre cord steel
CN109487162A (en) * 2018-12-13 2019-03-19 邢台钢铁有限责任公司 A kind of overweight loading die springs spring steel gren rod and its production method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102953005A (en) * 2011-08-19 2013-03-06 鞍钢股份有限公司 High-carbon and low-alloy steel wire rod for producing fine steel wires, and its manufacturing method
CN104451413A (en) * 2014-12-19 2015-03-25 重庆钢铁股份有限公司 Hard wire steel wire rod
CN107747060A (en) * 2017-11-12 2018-03-02 湖南华菱湘潭钢铁有限公司 The production method of high intensity high fatigue life spring steel
CN109047697A (en) * 2018-09-25 2018-12-21 湖南华菱湘潭钢铁有限公司 A kind of production method of tyre cord steel
CN109487162A (en) * 2018-12-13 2019-03-19 邢台钢铁有限责任公司 A kind of overweight loading die springs spring steel gren rod and its production method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110616361A (en) * 2019-11-06 2019-12-27 湖南华菱湘潭钢铁有限公司 Production method of steel for annealing-free nitriding
CN113789478A (en) * 2021-09-16 2021-12-14 湖南华菱湘潭钢铁有限公司 Production method of cold heading steel bar
CN113862564A (en) * 2021-09-16 2021-12-31 湖南华菱湘潭钢铁有限公司 Production method of deep-drawing high-carbon steel wire rod
CN114875314A (en) * 2022-04-26 2022-08-09 湖南华菱湘潭钢铁有限公司 Production method of high-aluminum alloy steel
CN114990446A (en) * 2022-06-21 2022-09-02 湖南华菱湘潭钢铁有限公司 Production method of weather-resistant high-strength high-carbon steel

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Application publication date: 20190719